The new technique relies on DNA's unique ability to self-assemble. The molecule is usually bound into a double helix made of two strands with complementary base pairs, or letters representing nucleotides: A's bind to T's, and G's bind to C's. By manipulating the DNA sequence, the team can create single strands of DNA that will bind to each other in specific ways, forming unique shapes.

DNA's base pairs "recognize each other automatically," Han said. "If you design the things right, they will grow into the right things."

From single strands of DNA, Han and his colleagues created a wireframe structure that could then fold into several other shapes, such as corkscrews, spheres and scissors.

The DNA-folding methods could one day help engineers create self-assembling robots that work inside the body, tiny chemical factories or molecular electronics.

But before that can become a reality, researchers need to develop standard ways of building any shape they can conceive of, Han said.

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Tia has interned at Science News, Wired.com, and the Milwaukee Journal Sentinel and has written for the Center for Investigative Reporting, Scientific American, and ScienceNow. She has a master's degree in bioengineering from the University of Washington and a graduate certificate in science writing from the University of California Santa Cruz.